Bubble Freer/Headspace Tool:

A bubble freer is a very
handy little tool to having in your canning toolbox aresenal. If you
have reviewed the Canner Problems
section, you will see that several problems can arrise in your canned
foods due to bubbles not being thoroughly removed from your preserved
jars of food.

Using a bubble
freer is fairly simple, you just need to slide it between the food
and the inside of the canning jar pressing in on the food gently to
allow the air bubbles room to come to the top.

If you do not have a
bubble freer, you can also use a non-metal spatula and acheive the same
results.

Many bubble freers can
also double as a headspace measuring device. They will have measurements
on them so that you can see how much space you have left in the top
of each jar.